An LED load driving apparatus including a power conversion circuit and a control chip is provided. The method and apparatus provides expansion of a NN space time block code to a MM space time block code, where M>N, by using phase hopping on the symbols within the NN space time block code to allow transmission of the space time block code on a number of diversity antennas greater than N. A received data query can be divided into multiple subqueries or data requests, such that each subquery is directed to a particular node identified by the first dimension of data referenced by the data query.